Zeinab Mahmoud Shakfa  <br/><br/>
Study of the nuclear shielding properties of some nano- composite materials /  
 دراسة خواص الحجب النووي لبعض مركبات النانو   
Zeinab Mahmoud Shakfa ; Supervised M.M. Sherif 
 - Cairo :   Zeinab Mahmoud Shakfa  ,   2016 
 - 82 P. :   charts , facsimiles ;   25cm 
<br/><br/>Thesis (M.Sc.) - Cairo University - Faculty of Science - Department of Physics 
<br/><br/> Nano Lead ( Pb) was prepared by ball milling using Polyvinyl alcohol  (PVA) as a surfactant. Pb/PVA mixture are milled for various times and  characterized with X-ray diffraction technique to determine the grain size  and micro strain. All powders morphologies were characterized with  Field emission  Scanning electron microscope . The nano-Pb/PVA at 60  min milling time was characterized by High Resolution  Transmission  electron microscope to confirm the nanometric size. The yielded nano- Pb/PVA were mixed with Polypropylene by various mass ratios. The  samples were tested against Gamma from 137Cs under the narrow beam  attenuation setup. The mass attenuation coefficients of the samples were  calculated experimently and compared with the theoretical values from  Nist-XCOM website.  
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<br/><br/><label>Subjects--Index Terms: </label>Ball milling  Lead Polymer nanocomposites